- #1
z-component
- 494
- 2
How does one use various liquids and their unique densities to determine the pressure of a gas in a manometer?
Determine the pressure of a gas in a manometer?
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Discussion Overview
The discussion revolves around determining the pressure of a gas using a manometer, specifically focusing on the application of various liquids and their densities in this context. The conversation includes both theoretical and practical aspects of using a manometer, including calculations related to pressure measurement.
Discussion Character
- Technical explanation
- Mathematical reasoning
Main Points Raised
- One participant inquires about the method for using different liquids and their densities to measure gas pressure in a manometer.
- Another participant suggests a straightforward calculation involving the product of density and height to determine pressure.
- A later post describes the use of a U-shaped manometer, explaining that the height difference between the liquid columns is crucial for calculating manometric pressure using the formula: Pressure = density of the liquid * gravity constant * height difference.
- This participant also notes that to find absolute pressure, one must add the manometric pressure to the atmospheric pressure, providing standard values for reference.
Areas of Agreement / Disagreement
Participants appear to agree on the basic principles of using a manometer for pressure measurement, but there is no explicit consensus on the application of different liquids or the nuances of the calculations involved.
Contextual Notes
The discussion does not address potential limitations related to the choice of liquid, assumptions about atmospheric pressure, or the specific conditions under which the measurements are taken.
- #2
russ_watters
Mentor
- 23,876
- 11,345
Pretty simple: [weight] density times height.
- #3
z-component
- 494
- 2
Thank you.
- #4
archie
- 8
- 0
manometer
on traditional manometer, i.e U-shaped tube, the height difference between the left and the right column is the "h"
To calculate the "manometric" pressure use this formula
Pressure = density of the liquid * gravity constant * the height difference "h"
To obtain the absolute pressure simply add this manometric pressure to the atmospheric pressure (i.e. on standard condition : 1 atm, 760 mmHg, 101.3 kPa)
Hope it helps
on traditional manometer, i.e U-shaped tube, the height difference between the left and the right column is the "h"
To calculate the "manometric" pressure use this formula
Pressure = density of the liquid * gravity constant * the height difference "h"
To obtain the absolute pressure simply add this manometric pressure to the atmospheric pressure (i.e. on standard condition : 1 atm, 760 mmHg, 101.3 kPa)
Hope it helps
- #5
z-component
- 494
- 2
Yes it does greatly. Thanks! 
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